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Find latitude and longitude of *utmost 20 countries, ordered by population, with a population greater or equal to the population limit given below and have atleast one currency exclusively for themselves. (countries like Madagascar, Sri Lanka but not India, USA).*
Use the country details from this dataset.

Your task is to find the sum of the length of all lines (in kms) that can be drawn between co-ordinates of these countries.

- Assume radius of earth:
**6371 km**
- Round length of each line and final result to
**2 decimal points**
- If co-ordinates are missing for any country use 0.000 N 0.000 E